package com.feng.reggie.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.toolkit.IdWorker;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.feng.reggie.common.BaseContext;
import com.feng.reggie.common.CustomException;
import com.feng.reggie.entity.*;
import com.feng.reggie.mapper.OrderMapper;
import com.feng.reggie.service.*;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.math.BigDecimal;
import java.time.LocalDateTime;
import java.util.List;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.stream.Collectors;

/**
 * 订单Service实现
 */
@Service
public class OrderServiceImpl extends ServiceImpl<OrderMapper, Orders> implements OrderService {

    @Autowired
    private ShoppingCartService shoppingCartService;

    @Autowired
    private OrderDetailService orderDetailService;

    @Autowired
    private UserService userService;

    @Autowired
    private AddressBookService addressBookService;

    @Override
    @Transactional
    public void submit(Orders orders) {
        //获得当前用户id
        Long currentId = BaseContext.getCurrentId();

        //查询当前用户的购物车数据
        LambdaQueryWrapper<ShoppingCart> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(ShoppingCart::getUserId, currentId);
        List<ShoppingCart> shoppingCarts = shoppingCartService.list(queryWrapper);

        if (shoppingCarts == null || shoppingCarts.size() == 0) {
            throw new CustomException("购物车为空，不能下单");
        }

        //查询用户数据
        User user = userService.getById(currentId);

        //查询地址数据
        Long addressBookId = orders.getAddressBookId();
        AddressBook addressBook = addressBookService.getById(addressBookId);
        if (addressBook == null) {
            throw new CustomException("配送地址未填写，不能下单");
        }

        //利用IdWorker工具类生成订单号
        long orderId = IdWorker.getId();

        //遍历购物车数据，计算总金额，并得到订单明细数据
        AtomicInteger amount = new AtomicInteger(0);//使用AtomicInteger变量来计算可以在多线程高并发中保证保证金额正确
        List<OrderDetail> orderDetails = shoppingCarts.stream().map((item) -> {//item是购物车里面的一条数据，可能是菜品也可能是套餐
            OrderDetail orderDetail = new OrderDetail();
            orderDetail.setOrderId(orderId);
            orderDetail.setNumber(item.getNumber());
            orderDetail.setDishFlavor(item.getDishFlavor());
            orderDetail.setDishId(item.getDishId());
            orderDetail.setSetmealId(item.getSetmealId());
            orderDetail.setName(item.getName());
            orderDetail.setImage(item.getImage());
            orderDetail.setAmount(item.getAmount());//这里设置的是单份的金额
            amount.addAndGet(item.getAmount().multiply(new BigDecimal(item.getNumber())).intValue());//累加计算总金额（每次遍历用单份的金额乘数量）
            return orderDetail;
        }).collect(Collectors.toList());

        //向订单表插入数据，一条数据（页面只传了地址id:addressBookId、支付方式:payMethod、备注:remark,所以orders对象的其他属性需要自己设置）
        orders.setNumber(String.valueOf(orderId));//订单号
        orders.setId(orderId);//订单号也是订单id
        orders.setUserId(currentId);
        orders.setUserName(user.getName());
        orders.setOrderTime(LocalDateTime.now());//下单时间
        orders.setCheckoutTime(LocalDateTime.now());//结账时间
        orders.setStatus(2);//订单状态 1待付款，2待派送，3已派送，4已完成，5已取消
        orders.setAmount(new BigDecimal(amount.get()));//实收总金额
        orders.setConsignee(addressBook.getConsignee());//收货人
        orders.setPhone(addressBook.getPhone());
        orders.setAddress((addressBook.getProvinceName() == null ? "" : addressBook.getProvinceName())
                + (addressBook.getCityName() == null ? "" : addressBook.getCityName())
                + (addressBook.getDistrictName() == null ? "" : addressBook.getDistrictName())
                + (addressBook.getDetail() == null ? "" : addressBook.getDetail())
        );

        this.save(orders);

        //向订单明细表插入数据，多条数据
        orderDetailService.saveBatch(orderDetails);

        //清空购物车数据
        shoppingCartService.remove(queryWrapper);
    }
}
